"The Secretary General strongly condemns all attacks on UN personnel and calls for a full investigation," deputy spokesman for the Secretary-General Farhan Haq said at a news conference.
"He underscores that all conflicts must be conducted in a way that ensures civilians are respected and protected."
Haq said it was too early to determine who is responsible for dropping or firing the explosive ordinance at the accommodation sites housing the workers.
At least five people were injured, several of them seriously, the executive director of the UN Office for Project Services (UNOPS), Jorge Moreira da Silva, said on Wednesday.
In the days prior, there had been impacts nearby and on the premises, prompting the organisation to contact the Israeli forces.
"This was not an accident," Moreira da Silva stated.
According to Moreira da Silva, the facility is a standalone installation well known to the Israeli military.
It remains unclear what type of projectile hit it.
He condemned attacks on humanitarian facilities as a violation of international law.
The Office for Project Services is involved in de-mining operations in the Gaza Strip.
The Israeli army initially denied the reports.
"Contrary to reports, the IDF did not strike a UN compound in Deir el Balah."
They urged the media to act with caution regarding unverified reports.
with DPA
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